ECOG performance scale is graded as follows:
Grade 0: Normal activity. Fully active, able to carry on all pre-disease performance without restriction.
Grade 1: Symptoms, but ambulatory. Restricted in physically strenuous activity, but ambulatory and able to carry out work of a light or sedentary nature (e.g., light housework, office work).
Grade 2: In bed <50% of the time. Ambulatory and capable of all self-care, but unable to carry out any work activities. Up and about more than 50% of waking hours.
Grade 3: In bed >50% of the time. Capable of only limited self-care, confined to bed or chair more than 50% of waking hours.
Grade 4:100% bedridden. Completely disabled. Cannot carry on any self-care. Totally confined to bed or chair.
Grade 5: Death
A lower ECOG performance score indicates a better quality of life.